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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5d638b5e80afcad69be0fd281d4a9608170a15a1319bde026b8bf315be4548' 
  AND token = 'IJgvgKLFUbNqGpetWXV/7LcHFXwA5pWd/td6MImXeFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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