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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618bf422555901d86aaaf052b466001a457c6e44538373c32580bf99990e5ce1' 
  AND token = 'eeVPKgN34OjlK7RFWql/O3wEbovrKaBKsv3dxK9JtE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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