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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3571c122a0c2439aae8df77a591ec0986f7b0935d08dbc06b880fcfa81548a53' 
  AND token = 'jnafInSx7E1o7xTtwtOCDzgAqfxPHshJua6xPhF97F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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