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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283acb25569ee8fd6579852bbe809376697f038d283953a7812bf791918f6fa0' 
  AND token = '4WwRoWSryDvrZi1oRw357JSvs9cnre5MQlcT+Tw5C4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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