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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4546da5676dc004affb8118bc731c9efc0b4ba91eb94d56a82bdc4e86f832819' 
  AND token = 'LJ1zRn/J7rZF35SnRinylE2Da7hRVYu6Vn6r5IbSP/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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