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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eafd32f62c355c290f9f44fb4708771bb1881f32515235750aac6dce84f34cd1' 
  AND token = 'dESL26zWDtvmLWsdn+1ezGyOA/9TPBaNkXfR6XCI+Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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