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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3afd65d199be7d01d3deda67e0b2aceea66182567ed201c1ab36273e5fbbc6' 
  AND token = 'YwoTyw57XqkcKPW1F9rgT/sh5bg4arc8FBsfIBhyDVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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