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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6ab49e65853a20d1219539f7f764f9b606b912b2c0805ad868201568ca02f5a' 
  AND token = 'v6UvC6XGetNqMbr0t3wHFraRlv/9I40/0czCPHU8tJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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