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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa36ca06a3e23b091e8d0b9bb407c0ddb7485525fd93007f3fdbf76f9f3dd41a' 
  AND token = 'Nog9xKz1nSPvkAZF1dkHjCdcm7bhPNToxjm7T3rKqDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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