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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08baa57208c5ff2a56d4ceabd301399c1f2022e60df26fb745d7f3191831467' 
  AND token = 'F2/3Q4tu5Aidf9HIif9QjIhw6P5yBu3uUyyMlvFAuFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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