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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b1426dfb0dc3c821c483d0f273d6fd17b7ff0f50c78ba4c44193af635bba93' 
  AND token = 'W4XEC6RYJ7zgcspSUaM0YGQW6h6Ru3sNRZbsQ9enUY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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