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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063ebafbdc01c2446a76ba81b261301a6319d2b13950d9c2a4644e63c729597a' 
  AND token = 'pPfbG/IkFgE4Iarn4W3rY5FMK45VTrRAvKOHImVNWtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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