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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610c61ce1764a06d46bec2cdf322f4e9761b36d7b38c0dc92f991e19dd5a236c' 
  AND token = 'kD7xaWl86GWyJU1dKutOsWu3FlIXEkq7gf4dNG5bcHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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