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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61b2e694572bf02dad02e2f04bbbf9771d9d6670ef3dda981d4421e6b751f8c' 
  AND token = 'h8ZfNEvNUaoO+Lb86DlmvQD+tmeYgMXmYDIyJ1DvT4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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