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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5875d77a43e8a30e523e171f064d535bb7fb751ebf3e886226169d872e59fe6f' 
  AND token = 'ScVzf46hL3Bz9wHJDflLH33flZrFtxiTewrTYZ/g98o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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