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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '749be31070e00c2bf0216c89d26de8ccdb817345721bc2b91d4dd9c713672a7b' 
  AND token = 'ob4i8bFd043aX28jFAKJ3jAcpoGGOQM3aGm8pMpWEPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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