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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6f9a7fc59c2b142cb3a9d07dfdb5af273a6713bcea52ef54b76564f58f09d2' 
  AND token = 'FVF2IUlLurpY7S8QpMJJmdx5+Pof4aRIP6biHLdFANM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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