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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da469d795a679b017eb712d4d6d7bebfd44a441f93126c52f7a7acc7e2af1d6b' 
  AND token = 'oEozo9qIi6k3jwlsPk1E2oa1S8Q4JdcPOoHV/zH7q5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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