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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bc47dcb91e0e6adeefc628339329e5d4cb414c71205784833194ca43685c89' 
  AND token = 'Lmcyp3BHyuv53RnC/8BcyfP1wlgps5wUJWg0A2mdb04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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