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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8110066d3b8be5176d9b904f40a9ab00c9c182a57f1c4de98e5a812bb9fa6e' 
  AND token = 'ocKq8j7FA78B9p1kgFCcxN858AtyrfR5NuSsv/EiL7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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