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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e736ec1b6cb3e13eeb856b0a8ae9c6ec5885c336c5e50ec475a13c1e91d8afe' 
  AND token = 'mqmKh0KWOpNyPIHKjltO5WtI/Z5bLDEMXRxQL7rDDkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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