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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb276527488d5cad752a7724f7f970c58c68da028b6d0bb1645cef33b4fad48f' 
  AND token = 'TKVd8QyX6PDgfnXnWbl66XHJ1FZUXFTgyTqGiiPby6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00157

JSON explain

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