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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d11d391c0cf885e9f70b619c644f9693a61ab53e1a367366fc705cc65aaeaed' 
  AND token = 'RZ92iaPVY2q6tDj9lm5SjRKZqZsU7GZIHqWAqvkkGhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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