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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a93e913cf79bd9518029c048e714076bb17d7a086caaf4cdcbede2697925d9d' 
  AND token = 'dzy6a22ADe8NN37JFwPgkC5LIYKq9kRFgyoCHWssB5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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