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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1cd355674a3b456d8be03fd34cf29915cae5f770b5758a2a283d782bd68f722' 
  AND token = '37wvN4VW7MNXisc0XLXFL0GZA2hcC0PYzbyVrKG4v2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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