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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982a65f4714994034af4bc71343d7f7e4be1ea9414af58424bfbac1320783d6a' 
  AND token = 'gnmTvXu/WFNhI0Rwp4gPYkMiF7Ooi3rFsYRfVjeVdzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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