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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9202df71a417b80d82a04ec81b8931d8284f35273ff84b1ce879c3a09ccb8ddd' 
  AND token = '+fvLSYnKLTLGZT/tdYJ/DxWKYxvDHZN5173/aRC80yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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