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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba2cf0b0eba56f3ec016ffb99e77a2fd48bdf8aa7580608fa9b778d9bd274fa' 
  AND token = 'nFKCI4zZw51ifXiURNgfBkvS1KznHeou92e6LaOgLbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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