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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4dcc127e2b1af991bf2599b7d1093ba34cca12d9f907c95aedee61e8f8286a' 
  AND token = 'IyQ1icOeuJ0W88P4sHITGL18uA+5LNgddXziLOJLJ3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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