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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077c2439442e6d86dc78352daf025c18ac79bf2a47fd0f223baaa0cd7f0cdc67' 
  AND token = 'G37b4c7lOVstMgYK3lcDRyr7fZLFloXw+p1lewktBkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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