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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce9b7e3e00f33ba3785ea1fe82c2d2dedbf48e7930912a9b4a311193917f31a' 
  AND token = 'BmrIypo2cpsc61SolxVxV7PfNWNmGnxqZVoMcPAA0oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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