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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0b1ed5126a73e78bf3728aaa6a70b41036ab7520695f247904d02770b920a7' 
  AND token = '0a8X6uMV3Z83xnFB6zzGvbBqVEp5thyNBmq3FgoXK8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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