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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ea267d54d7d2cff57b2fa290d8bb21164a546d6f403ac5f8bda916855f83ac' 
  AND token = 'gdelm7SyEQEEqrABXIwd/1kFWHL6DcsnLJmyfn934oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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