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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44817e82e274cafc397c5f4c37a687dba98485d90d73d4cad845bca90a42bd00' 
  AND token = 'tb5xiAQnJDMFPSaQJIaYabImV1+5S4O2M5N67j+Jgrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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