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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419923663a5b04b8cbd1b1ab5884cfc941a832009e16bac86f63e01302d0dbec' 
  AND token = '9e0xuz1I5tZKCFlTYwbZDyZtJB2F9FiQloWwy+uWz1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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