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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dbfc01b2fb1b09590cb9f486272934fe4e4fb0c3331be780d5c7e85cfd171c6' 
  AND token = 'oLZstYk8O6bA+8suLvyprW+wctlzbAMYoaO6z8bMtPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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