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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec5c77c7cef59619b34713cf736e6aad6e947d4a5df1be53b6c6c1a65e0fa31' 
  AND token = 'OD9oAPxj9uZIqcbSnCjgo240O4HxbARzGujlxiV19JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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