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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310ae7be2f3caef4f60a08bac501c0c9218a80b365b99a79279e73501924125c' 
  AND token = 'hW55mDH0c3K+WCSowG/pBP+Wl5K0ZBbNfPy1JSodoCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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