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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81256e92e7ecdbf224492af1ea2b74eb9fea10dd0c5bd60a89d24447cdd97118' 
  AND token = 'd76L0fwXP6ojUi5S/y1gotEfaT2lJP9pNGw1PZ4c9yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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