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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '309fe263381576f1b67f8ea0854a65b670e2ed4be6257aed5b83f382b0b9c366' 
  AND token = 'p5abFSB4jHI5fQi6QmZQ9reo0xqbjwGtBgVzALIHTYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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