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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ca1767455f1ef681835ca46ce4132fa03b2468c050823cbdf611a940121b03' 
  AND token = 'uclZAEJipKz4GJSw/Vf3IkHLfzDztZExOSwzJZABts4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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