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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c5fd51fbc78d05a74f7aa2668d78fb3d725faa5bd357276fb85da1c47002e5' 
  AND token = 'sT0w3WRZ+2nVZRzwXiAY7QR+zr6tiuRV459YLs/azu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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