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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e8c2b3fdf7159d985c90d91b6c3554b9e8a5dbe039bdf3fe9a63e00da534956' 
  AND token = 'lGibW28/atVNwuDTbuBdgkM/HddWc3uj+EbhYJOioyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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