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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccb4add3a8daf6858116d69a68a98ea5e600e2ac3f37f5e9832d5262c1dc84f' 
  AND token = 'Eh67uTer3JFPMpGlZhjkftYI/SOn5IP3G3MVZTJEJ+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}