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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e24c30a4570544426f49e42d69c6403cd35121cf5cdcb22c24fb1114bb5159a' 
  AND token = 'Q54OL6MKHN2JCSecDbgLO+QqFyTeEjW576XZNVRgKz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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