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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f580edea6bb19d59a9bad095627fc20e32fa2473df325a7df69dd0c7632473' 
  AND token = 'i6QThjCDBAxM7Pa/5WoydY/bVGSsihXgAHVo1shmX4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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