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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a51bc703153a61937339225ddd01a49daeb25e0cbf6176e87ebcd13caea0a9' 
  AND token = 'WGcYPcW4QgfhiT/0JBQ/ft6S4As61SUi4DgwR/hdon8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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