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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807d7f78942a7e437eb42bbe33f3c7eb42afe4920ed86f1434dacc8cc26b0b31' 
  AND token = 'DaJo1yR4NKn84/U6NFsGPFQWqECszru8Y59V1lvLnio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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