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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7adb776c29f2c5df6b9adc680cfa0a8ceef379cd036616a7d061ae44be9309b1' 
  AND token = 'Tk5vaVRSoKoeqvREGyLi3z2mlU2A74C8tqcgO7x76xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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