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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf91a552d91e8e5d2eeba09897853e58d3a58699a011793fa33253aeb1e1e313' 
  AND token = 'EwvVPea6NBEk6xZWg+O38R56mAodjI0yrhk+PhryEm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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