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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c84bcf8c589a37cc695416c6dc66fa689d6014df8c51dfdb4772f242f9a45e7' 
  AND token = 'n85UlwGYjZ8NXvOPGObO7uMx8W6pQA2gk0Bk9FatGBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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