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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e816b5bda5ec9ae61531e268a001abe2b1ac5cf0b7ffd7336bcc5a8ef8de761' 
  AND token = '/RBtTocflHeMvFT7Eq2Zpp9/jA1oQtLI6dTlCCeGJ2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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