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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900a96c2ea2c72b674328d00a93c5bf02c75f8c8ef68f5702d3423378ba23d33' 
  AND token = 'XqYb4wMv0w0nF/lXZt1dCw89Sir2msGvXqAwWw54e/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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