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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fad11d23cc5aadcde1883805a2c71cf5b55481e14858e6e57fd6ca0534804c' 
  AND token = 'pCXkVcEo+KTNMR0/f80kOFLqrCAosIeJAQ5gL4Z2Fz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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