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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1849e7ec4a3b58ac8c2c2776eec95ab83b1d4ec578376db7952f7e2ad59a37' 
  AND token = 'K0pZmQixoTB1/hn93knwUv3EdlfwtApT/h9ai32gPvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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