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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ef8638e01ce78e1b398362e0f416739a5600e33b99f6ab1cb41aae5bcb313e' 
  AND token = 'J+/SCix+A91nd/XXjsQeGwDB+czhaDMSghszEyUlPt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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