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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6968626d7f2af4c36dab3c9998ca1d761243fb7838c5cbad64e2fbaf78bdd3b9' 
  AND token = 'cY9yQkaOket18CKciilagGYHJ2EoTmh0uMAHSGEaKoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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