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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80750ae8d15276d08b273292bd5d4adf64934946f082dec88548f01a24632f3a' 
  AND token = '3s+K5udkYTvjab7Rj/AdkG8cXq4QzoY4PCHcngQd6Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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