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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d41a79c7bbb436a3acafa28842de41c74b5c57ccd9fe6421562f313112cf036' 
  AND token = 'FJG+YbfPPEQ7pO4nbQZol6zQV8TAjSaFbR2tq8qfZiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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